Job portals and campus placements usually want one file, in a specific order, under a size cap. Assembling that from five different PDFs is the annoying part.
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Résumé first — it decides whether the rest is read. Then mark sheets, then degree or passing certificate, then experience letters, then ID proof.
Merge in that order: files merge top to bottom, so arrange them in the list before clicking merge.
Rotate any sideways scans first — a certificate that appears upside down reads as carelessness.
Crop the dark scan borders; they waste space and look unprofessional. Delete blank pages.
Mask Aadhaar and PAN to the last 4 digits if an ID is requested. Recruiters do not need the full number, and you should not hand it over.
Merge first, compress once at the end. Compressing individual files then merging wastes quality twice.
If the cap is 500 KB and you have eight pages of certificates, expect to trade some sharpness. Text pages survive compression well; photographs of certificates do not.
Only when asked. Attaching Aadhaar unprompted is an unnecessary exposure — and if you must, mask all but the last four digits.
Usually yes for text-based résumés plus a few scanned certificates. Crop margins and delete blank pages first.

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